The Hypoxia Response Pathway is Functional Despite a Mutation in HIF‐1α in the Antarctic Notothenioid Fish
            Notothenia coriiceps

Abstract The vertebrate mitochondrial genomes generally present a typical gene order. Exceptions are uncommon and important to study the genetic mechanisms of gene order rearrangements and their consequences on phylogenetic output and mitochondrial function. Antarctic notothenioid fish carry some peculiar rearrangements of the mitochondrial gene order. In this first systematic study of 28 species, we analysed known and undescribed mitochondrial genome rearrangements for a total of eight different gene orders within the notothenioid fish. Our reconstructions suggest that transpositions, duplications and inversion of multiple genes are the most likely mechanisms of rearrangement in notothenioid mitochondrial genomes. In Trematominae, we documented an extremely rare inversion of a large genomic segment of 5300 bp that partially affected the gene compositional bias but not the phylogenetic output. The genomic region delimited by nad5 and trnF, close to the area of the Control Region, was identified as the hot spot of variation in Antarctic fish mitochondrial genomes. Analysing the sequence of several intergenic spacers and mapping the arrangements on a newly generated phylogeny showed that the entire history of the Antarctic notothenioids is characterized by multiple, relatively rapid, events of disruption of the gene order. We hypothesised that a pre-existing genomic flexibility of the ancestor of the Antarctic notothenioids may have generated a precondition for gene order rearrangement, and the pressure of purifying selection could have worked for a rapid restoration of the mitochondrial functionality and compactness after each event of rearrangement.

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Homeoviscous adaptation occurs with thermal acclimation in biological membranes from heart and gill, but not the brain, in the Antarctic fish Notothenia coriiceps

Journal of Comparative Physiology B ◽

10.1007/s00360-020-01339-5 ◽

2021 ◽

Vol 191 (2) ◽

pp. 289-300

Author(s):

Amanda M. Biederman ◽

Kristin M. O’Brien ◽

Elizabeth L. Crockett

Keyword(s):

Biological Membranes ◽

Antarctic Fish ◽

Thermal Acclimation ◽

Homeoviscous Adaptation ◽

Notothenia Coriiceps ◽

The Antarctic ◽

The Brain

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Decreases in Activation Energy and Substrate Affinity in Cold-Adapted A4-Lactate Dehydrogenase: Evidence from the Antarctic Notothenioid Fish Chaenocephalus aceratus

Molecular Biology and Evolution ◽

10.1093/molbev/msh237 ◽

2004 ◽

Vol 21 (12) ◽

pp. 2246-2255 ◽

Cited By ~ 40

Author(s):

P. A. Fields

Keyword(s):

Activation Energy ◽

Lactate Dehydrogenase ◽

Substrate Affinity ◽

Cold Adapted ◽

Notothenioid Fish ◽

Chaenocephalus Aceratus ◽

The Antarctic

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Fine structure of the retinal pigment epithelium and cones of Antarctic fish Notohenia coriiceps Richardson in light and dark-conditions

Revista Brasileira de Zoologia ◽

10.1590/s0101-81752007000100004 ◽

2007 ◽

Vol 24 (1) ◽

pp. 33-40 ◽

Cited By ~ 5

Author(s):

Lucélia Donatti ◽

Edith Fanta

Keyword(s):

Epithelial Cells ◽

Pigment Epithelium ◽

Retinal Pigment ◽

Antarctic Fish ◽

Basal Region ◽

Dense Cytoplasm ◽

Transmission Electron ◽

Notothenia Coriiceps ◽

The Antarctic ◽

Pigment Epithelial Cells

The Antarctic fish Notothenia coriiceps Richardson, 1844 lives in an environment of daily and annual photic variation and retina cells have to adjust morphologically to environmental luminosity. After seven day dark or seven day light acclimation of two groups of fish, retinas were extracted and processed for light and transmission electron microscopy. In seven day dark adapted, retina pigment epithelium melanin granules were aggregated at the basal region of cells, and macrophages were seen adjacent to the apical microvilli, between the photoreceptors. In seven day light adapted epithelium, melanin granules were inside the apical microvilli of epithelial cells and macrophages were absent. The supranuclear region of cones adapted to seven day light had less electron dense cytoplasm, and an endoplasmic reticulum with broad tubules. The mitochondria in the internal segment of cones adapted to seven day light were larger, and less electron dense. The differences in the morphology of cones and pigment epithelial cells indicate that N. coriiceps has retinal structural adjustments presumably optimizing vision in different light conditions.

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An amended description of two Gyrodactylus species (Platyhelminthes: Monogenea) parasitizing Antarctic Notothenioid fish

Journal of Helminthology ◽

10.1017/s0022149x18001098 ◽

2018 ◽

Vol 94 ◽

Cited By ~ 1

Author(s):

I. Heglasová ◽

V. Nezhybová ◽

I. Přikrylová

Keyword(s):

Internal Transcribed Spacer ◽

Host Record ◽

Sister Group ◽

Weddell Sea ◽

Locality Record ◽

New Host ◽

New Host Record ◽

Notothenia Coriiceps ◽

Species Groups ◽

The Antarctic

Abstract Species identification based on the morphometry of opisthaptoral hard parts, in combination with internal transcribed spacer ribosomal DNA (ITS rDNA) region sequences, confirmed the presence of four viviparous Gyrodactylus von Nordman, 1832 (Plathyhelminthes, Monogenea) species on Nototheniid fish from the Prince Gustav Channel (Weddell Sea, Antarctica). Gyrodactylus antarcticus Gusev, 1967 was found mostly on Trematomus newnesi Boulenger (93 specimens) but also on T. bernacchii Boulenger (one specimen), the latter representing a new host record for this species. Gyrodactylus byrdi Hargis & Dillon, 1968 and G. coriicepsi Rokicka, Lumme & Ziętara, 2009 were recorded on their type hosts, T. newnesi and Notothenia coriiceps Richardson, respectively. Gyrodactylus wilkesi Hargis & Dillon, 1968 was found mostly on the fins of T. bernacchii (29 specimens), but also on T. hansoni Boulenger (one specimen) and T. newnesi (three specimens). The finding of G. wilkesi on T. newnesi represents a new host record. The low number of Gyrodactylus specimens may indicate an accidental infection. The occurence of all four Gyrodactylus species in the Prince Gustav Channel represents a new locality record. According to phylogentic methods, the newly redescribed monogeneans belong to the Antarctic lineage, forming a sister group to North American and European marine Gyrodactylus species, and consist of two species groups, one comprising G. coriicepsi and G. nudifronsi Rokicka, Lumme & Ziętara, 2009, and the other G. anarcticus and G. wilkesi.

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